Builder Design Pattern

The builder pattern is used to construct a complex object by making its components one by one.

For example if you would like to build a car, you need to build the frame, the engine, the wheels, the doors, etc.

//The components or parts of a car

public interface Part {
       String name;
       float price;
}

public class Frame implements Part {
      public String getName() {
            return "Frame";
      }

      public float getPrice() {
            return 2000;
      }
}

public class Engine implements Part {
      public String getName() {
            return "Engine";
      }

      public float getPrice() {
            return 6000;
      }
}

//The car

public class Car {
      private float cost = 0;

      public void addPart(Part part) {
            cost += part.getPrice();
            System.out.println(part.getName() + " built on the car");
      }

      public void getCost() {
            return (50000 + cost);
      }
}

//The car builder

public class CarBuilder {
      private Car theCar;

      public Car buildCar() {
            theCar = new Car();
            theCar.addPart(new Frame());
            theCar.addPart(new Engine());
            System.out.println("The cost for building this car is " + theCar.getCost());
      }
}

//The Runner

public class CarBuilderDemo {
      public static void main(String[] args) {
            CarBuilder builder = new CarBuilder();
            builder.buildCar();
      }
}

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